Hi, I want to have my equations numbered like (section.formula) so I put the comand
\numberwithin{equation}{section} in the preambule. I did in a document and it worked. My problem is that now, I created a new document and it doesn't work. It's the same type (article) and I write exactly the same thing in the preambule but in one document it works and in the other I got the error message: \numberwithin {equation}{section} The control sequence at the end of the top line of your error message was never \def'ed. If you have misspelled it (e.g., `\hobx'), type `I' and the correct spelling (e.g., `I\hbox'). Otherwise just continue, and I'll forget about whatever was undefined. and \numberwithin{e quation}{section} You're in trouble here. Try typing <return> to proceed. If that doesn't work, type X <return> to quit. If someone knows what I might be doing wrong. I'm new in LyX and I cannot fix it. Thanks. -- View this message in context: http://www.nabble.com/Problems-with-equation-numbering-tp15773113p15773113.html Sent from the LyX - Users mailing list archive at Nabble.com.